NumInteriorRing
NUMINTERIORRING(p Polygon)
Alias: ST_NUMINTERIORRING
Returns the number of interior rings in p. Interior rings are holes in the polygon.
Result type: integer
Example:
SELECT NUMINTERIORRING(POLYFROMTEXT('POLYGON((0 0, 0 10, 10 10, 10 0, 0 0), (2 2, 2 4, 8 4, 8 2, 2 2), (2 6, 2 8, 8 8, 8 6, 2 6))'));
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col1
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2
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Last modified date: 08/28/2024